Current Mode PWM Controller  
Part No. Features Function VCC UVLO (Typ.) Freq. CS(V) Duty Cycle Start-up current Operating
current
Package
Max. Vcc(ON) Vcc(OFF) Max. Typ.  Max. Max. Max.
UC2843B High Performance Current Mode PWM Controllers

* Latching PWM for cycle-by-cycle current limiting
* Trimmed oscillator discharge current
* Automatic feed-forward compensation
* Internally trimmed reference with UVLO
* Double-pulse suppression
Single End,Vref=5V±1%,
OCP, SCP, LEB, UVLO
30.0V 8.4V 7.6V 500KHz 1.0V 100% 0.5mA 17mA DIP-8 SOP-8
UC3842A *Low Start Up Current ( Typical 0.12mA )
*Automatic Feed Forward Compensation
*Pulse-by-Pulse Current Limiting
*Double Pulse Suppression
*High Current Totem Pole Output to Drive MOSFET
  Directly
*Internally Trimmed Band Gap Reference
*500kHz Operation
Single End,Vref=5V±2%,
OCP, SCP, LEB, UVLO Ist=0.12mA(Typ.)
30.0V 16.0V 10.0V 500KHz 1.0V 100% 0.3mA 17mA DIP-8 SOP-8
UC3843A 8.4V 7.6V
UC3842B High Performance Current Mode PWM Controllers

* Trimmed oscillator for precise frequency control
* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* High current totem pole output
* Undervoltage lockout with hysteresis
Single End,Vref=5±2%,
OCP, SCP, LEB, UVLO
Ist=0.3mA(Typ.)
30.0V 16.0V 10.0V 500KHz 1.0V 96% 0.5mA 17mA DIP-8 SOP-8
UC3843B 8.4V 7.6V
UC3842G * Low startup and operating current
* User defined switching frequency(Norm is 52kHz)
* Power-saving mode for low power
* Under voltage lockout with hysteresis
* Latching PWM for Cycle-By-Cycle current limiting
* Internally trimmed reference with undervoltage lockout
Single End,Vref=5±1%,
Hopping Technology,
Frequency BurstPFMPWM,
500mA Driving Capability
OVP,OLP,UVLO,OCP, SCP, LEB Etc.
30.0V 15.0V 10.0V CT=3.3nF 1.0V 94% 40uA 10mA DIP-8 SOP-8
55KHz
UC2844  High Performance Current Mode PWM Controllers

* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* High current totem pole output
* UVLO with hysteresis
* Low startup and operating current
* Operation Temperature = -40 ~ 120
Single End,Vref=5V±1%,
OCP, SCP, LEB, UVLO
Ist=0.3mA(Typ.)
30.0V 16.0V 10.0V 500KHz 1.0V 50% 0.5mA 17mA DIP-8 SOP-8
UC2845 8.4V 7.6V
UC3844  High Performance Current Mode PWM Controllers

* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* High current totem pole output
* UVLO with hysteresis
* Low startup and operating current
* Operation Temperature = -40 ~ 125
Single End,Vref=5V±2%,
OCP, SCP, LEB, UVLO
Ist=0.3mA(Typ.)
30.0V 16.0V 10.0V 500KHz 1.0V 50% 0.5mA 17mA DIP-8 SOP-8
UC3845 8.4V 7.6V
UC3846 Current Mode PWM Controller

* Built-in under-voltage lockout
* Soft start
* Programmable pulse-by-pulse current limiting
* Improved load response characteristics
* Double pulse suppression
Half Bridge/Push Pull,
Vref=5.1V±2%,
Shutdown, Soft Start, OCP,
SCP, LEB, UVLO, Sync Teminal
40.0V 7.7V - 500KHz 1.2V 50% - 21mA DIP-16 SOP-16 SOP-16W
UC3943 * With burstmode for lower standby power
* With greenmode for higher light load efficiency
* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* Internally trimmed reference with undervoltage
   lockout
* High current totem pole output
* Undervoltage lockout with hysteresis
* Low startup and operating current
Single End,Vref=5V±2%,
OCP, SCP, LEB, UVLO,
Ist=0.12mA(Typ.)
30.0V 8.4V 7.6V 250KHz 1.0V 96% 0.5mA 17mA SOP-8
UC2846 Current Mode PWM Controller

* Built-in under-voltage lockout
* Soft start
* Programmable pulse-by-pulse current limiting
* Improved load response characteristics
* Double pulse suppression
* Operation Temperature = -40 ~ 85
Half Bridge/Push Pull,
Vref=5.1V±2%,
Shutdown, Soft Start, OCP,
SCP, LEB, UVLO, Sync Teminal
40.0V 7.7V - 500KHz 1.2V 50% - 21mA DIP-16 SOP-16 SOP-16W
UC2842B* High Performance Current Mode PWM Controllers

* Trimmed oscillator for precise frequency control
* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* High current totem pole output
* Undervoltage lockout with hysteresis
Single End,Vref=5±2%,
OCP, SCP, LEB, UVLO
Ist=0.3mA(Typ.)
30.0V 16.0V 10.0V 500KHz 1.0V 96% 0.5mA 17mA SOP-8 DIP-8
*Under  Development
啃僅